Means for stretching covering around pulleys.



No. 874,182. I PATENTED DEC. 17, 1907.. A. B. GERBRAND.

MEANS FOR STRETGHING COVERING AROUND PULLEYS. APPLIQATION FILED APR. 23, 1907.

:12. G rwnd ET. s cm, WASHINGTON, 1:v c.

ABRAHAM B. GERBRAND, OF BUH LER, KANSAS.

MEANS FOR, STRETGHING COVERING AROUND PULLEYS.

Specification of Letters Patent.

Patented Dec. 17, 1907.

Application filed April 23, 1907. Serial No. 369,822.

To all whom it may concern:

Be itknown that I, ABRAHAM B. GER- BRAND, citizen of the United States, residing at Buhler, in the county of Reno and State of Kansas, have invented certain new and useful Improvements in Means for Stretching Covering Around Pulleys, of which the following is a specification.

This invention provides a mechanism by means of which the covering of pulleys is greatly facilitated and time and labor saved, the machine being of such formation as to be adapted to pulleys of different diameter and varying in width, and whether the face is strai ht or beveled, the machine operating equa 1y well and serving to stretch the coverlng with any desired degree of tension and holding the covering until fastened.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction and the means for effecting the result, reference is to be had to the followingdescription and accompanying drawings.

While the invention may be adapted to different forms and conditions by changes in the structure and minor details without departing from the spirit or essential features thereof, still the preferred embodiment is shown in the accompanying drawings, in which:

Figure 1 is a perspective view of a machine embodying the invention showing its application. Fig. 2 is a central transverse section. Fig. 3 is a front view of an end portion of the machine, the near portion of the adjustable clamp member being broken away.

Correspondmg and like arts are referred to in the following descriptlon and indicated in all the views of the drawings by the same reference characters.

The machine comprises two frames which are relatively movable, the one adapted to be clamped to the pulley and the other to firmly grip the covering, and means for positively moving the said frames whereby the covering is stretched around the pulley to the requisite tension and held in said position until firmly secured.

The frame designated as the pulley frame and adapted to be secured thereto, comprises a longitudinal bar 1 and side pieces 2, the latter being in the nature of standards and projected from end portions of the longitudinal bar in parallel relation and either secured theretoor forming a part thereof, the former construction being preferred. The side ieces or standards 2 have extensions 3 pro ecting in the same direction and away from the plane of the standards and supporting a bar 1 having a central opening in which is mounted a set screw 5 designed to effect relative movement of the two frames. The clamp members are adjustable upon the longitudinal bar l and are provided in pairs, each pair adapted to grip one side of the rim of the pulley 6' to be covered. The clamp members 7 are automatically adjustable so as to conform to the face of the pulley whether the same be straight or beveled. In addition to this pivotal adjustment, the clamp members 7 are adjustable in the length of the bar 1 according to the width of the pulley to be covered so as to engage with edge portions of the face of the rim thereof.

The clamp members 7 are of U-form, the said members embracing o posite sides of the bar 1 and having inward y extended projections 8 entered into longitudinal grooves 9 formed in opposite sides of the bar 1, thereby serving to retain said members in place and forming pivots for the members to turn upon. The inner face of the horizontal portion of each clamp member 7 is curved 1n the length of the bar 1 to provide an element for contact with said bar to sustain the clam ing force when the clamp member is un er tension, thereby relieving the projections 8 of the compressive strain which would otherwise tend either to bend or break the same. The cooperating clamp members 10 are slidable upon the bar 1, each consisting of a shank provided at one end with a cuff 11 to embrace the bar 1 provided at its opposite end with a laterally extended portion 12 in which is formeda threaded opening to receive a clamp screw 13 which is adapted to engage the inner face of the rim of the pulley, thereby gripping said rim between the part 7 and the clamp screw 13. The laterally extended ortions 12 face each other and result in ringing the clamp screws 13 opposite to the respective complemental clamp members 7. The frame for clamping the covering 14 comprises a bar 15 having end pieces 16 and these parts may be of integral formation, or if separately formed,

joined in any substantial way. It is preferred, however, to form the parts 15 and 16 of a single bar whose end portions are bent about at a right-angle in the same direction. The end pieces 16 are arranged to come alongside the inner faces of side pieces 2 and are pivoted to the latter at 17. Lugs 18 project inward from the end pieces 16 and are formed with threaded openings in which are fitted set screws 19. A clamp bar 20 parallels the bar' 15 and is adapted to grip the covering 14 by the action of the set screws 19, said covering being passed between the bars 15 and 20. The clamp bar 20 is notched in its ends to receive the respective end pieces 16 thereby preventing relative displacement of the clamp bar while at the same time admitting of its movement towards and from the bar 15 to clamp or release the covering 14 as may be desired. A pair of lugs 21 project upwardly from the clamp bar 20 and pivotally support a nut 22 which receives the set screw 5 and cooperates therewith to effect relative movement of the two frames when placing the covering 14 under tension as when stitching the same about the pulley 6.

As indicated in Fig. 1, the pulley to be covered has one end of the covering'secured thereto, after which the machine is clamped to the pulley in the manner stated, the clamp members 7 being moved to engage with opposite sides of the outer face of the pulley and the clamp screws 13 engaging with the inner face of opposite side portions of the pulley, the clamp screws being turned so as to firmly grip the pulley between them and the bars 7. The covering 14 is passed between the bars 20 and 15-and after being stretched by hand, is clamped by turning up the set screws 19. It is noted that the pulley 6 is arranged so as to occupy a central position, thereby equalizing the strain throughout the length of the machine. Upon operating the set "screw 5 which may be turned either by a rod or other implement, the two frames are separated, or more properly speaking, the frame gripping the covering is swung upon its pivots 17, thereby subjecting the covering to tension, and after the covering has been stretched to the required degree, it is made fast to the pulley either by rivets or any desired way. The set screw 5 is now backed so as to relax the tension upon the covering and the set screws 19 are loosened so as to release the covering after which the clamp screws 13 are turned outward to release the machine which is moved forward upon the pulley and the parts retightened preliminary to operating the set screw 5 for stretching another portion of the covering about the pulley, this operation being repeated until the pulley is completely covered.

Having thus described the invention, what is claimed as new is:

1. A machine for stretching covering around pulleys, the same comprising relatively movable frames each provided with clamp means, the one for attachment to the pulley and the other for gripping the covering and means for separating the said frames chine to pulleys of different widths, and

means for moving the two frames apart for subjecting the covering to tension.

3. A machine for stretching covering about pulleys, the same comprising relatively movable frames, means for separating the frames to subject the covering to tension, means applied to one of the frames for gripping the covering, and clamp means ap plied to the other frame for securing the same to the rim of the pulley, said clamp means embodying a self adjusting clamp member to automatically conform to the nature of the pulley whether straight or beveled.

4. A machine for stretching covering about pulleys, comprising cooperating relatively movable frames, one of said frames being provided with means for gripping the covering, and clamp means applied to the other frame, said clamp means comprising pairs of adjustable clamps, each clamp formed of a self adjusting clamp member, and a complemental clamp member formed of a shank having a laterally extended end in which is fitted a clamp screw.

5. A machine for stretching covering about pulleys, comprising relatively movable frames, one of the frames provided with. means for gripping the covering, means for separating said frames to subject the cover ing to tension, the other frame comprising a longitudinal bar having grooves in opposite sides, clamp members adjustable on the longitudinal bar and embracing opposite sides thereof and having inner projections to enter the grooves thereof to retain said clamp members in place and admit of their turning, and cooperating clamp members slidable upon said longitudinal bar and provided with clamp screws.

6. A machine for stretching covering about pulleys comprising two frames pivotally connected and each comprising a longitudinal bar, a set screw fitted to one of the frames, a nut having pivotal connection with the other frame and cooperating with said set screw, a clamp bar cooperating with the longitudinal bar of one of the frames, set screws moving said clamp bar to effect gripping of the covering, adjustable clamp memother frame and having the sides in juxtaing frame for engagmg the covering, and position to said bar curved in the direction of means for moving the swinging frame to the-length thereof and compl'emental clamp stretch the covering. 5 members slidable upon said longitudinal bar In testimony whereof I aflix my signature 15 provided with clamp screws. in presence of two witnesses.

7. A machine for stretching covering ABRAHAM B. GERBRAND. [1 s] about pulleys comprising a main frame, Witnesses: means for securing the main frame to a pul- P. T. NICKEL, 10 ley, a swinging frame loosely mounted upon P. A. MARTENs.

bers fitted to the longitudinal bar of the I the main frame, means carried by the swing- 

